Lynx Distributor M8 vs M10 and Which Fuses to Use

Lynx Distributor M8 vs M10 is one of the most common questions when planning a Victron DC system. The short answer: the label only refers to the bolts that join one Lynx module to the next. Fuse studs and cable studs are M8 on both. Both versions carry the same 1000A rating, but you can’t bolt an M8 module directly to an M10 module. Pick one size for your whole Lynx chain.

Road Widgets adds a Lynx Distributor 1000.

Lynx Distributor M8 vs M10: What Changes

	M8 version	M10 version
Module-to-module joint bolts	M8	M10
Fuse and cable studs	M8	M8
Current rating	1000A continuous	1000A continuous
Joint torque	14Nm	33Nm (17Nm on units with serial before HQ2340)
Fuse/cable nut torque	14Nm	14Nm (M8 nuts)
Connects directly to the other version	No	No

Source: Victron Lynx Distributor M8 and M10 manual.

Which One Should You Buy?

Match the modules you already have, or plan to add. Victron’s manual notes the Lynx Smart BMS comes as a 500A model with M8 or M10 busbars, or a 1000A model with M10 only. The Lynx Distributor product page also describes the modular system as available with M10 busbars. So for a new build heading toward a 1000A Lynx Smart BMS, M10 keeps your options open. If you already own M8 modules, stay with M8.

Which Fuses to Use

The Lynx Distributor holds MEGA fuses, sold separately.

System voltage	MEGA fuse voltage rating
12V or 24V	36V-rated MEGA fuses
48V	58V-rated MEGA fuses

Victron’s fusing rules from the manual:

Match each fuse to its circuit. Size the fuse for the maximum current that circuit and its cable can carry.
Don’t exceed the module rating in total. The combined value of all fuses shouldn’t exceed the current rating of the lowest-rated Lynx module in the chain.
Fill all four slots. Use dummy fuses in unused positions so the fuse LED doesn’t show a false alarm.
Check the middle-row nuts are tightened to 10Nm before fitting the fuses.

Fuse Sizing Example (Estimate)

A 3,000W inverter on 12V draws about 250A (3,000 ÷ 12, before losses), more at low battery voltage. That circuit needs cable rated for the current and a fuse sized to protect the cable. Check the inverter manual’s recommended fuse. A 50A DC-DC charger and a 30A solar controller get their own smaller fuses. Victron’s book Wiring Unlimited covers the calculations in detail.

Class-T Option

If you want Class-T fusing for a large lithium bank, Victron also makes a Lynx Class-T Power In module, with the same 1000A rating.

Victron’s Lynx Distributor product page has the full datasheet and manual downloads.

Worked Example: Filling the Four Slots on 12V

A 12V van or boat with a Lynx Distributor feeding four circuits:

Slot	Circuit	Example fuse
—	—	—
1	MultiPlus-II 12/3000	400A MEGA (from the inverter manual)
2	Orion XS 12/12-50A output to the house bank	70A MEGA
3	SmartSolar MPPT 100/50	60A MEGA
4	DC fuse box for lights, fridge and pumps	100A MEGA

The total is 630A, below the 1000A Lynx module rating (example sizing). Each fuse value must also suit its own cable and device, so check every manual.

Worked Example: A 48V System

On 48V, the same 3,000W inverter draws about 63A rather than 250A (estimate: 3,000W ÷ 48V). Fuses get smaller, but they must be 58V-rated MEGA fuses, because a charging 48V bank exceeds the 36V rating used on 12V and 24V. A typical 48V layout might use an 125A MEGA for the inverter and smaller 58V fuses for the MPPT and DC-DC converter (example sizing).

Worked Example: Using Dummy Fuses

A van using only three of the four slots fits a dummy fuse in the fourth. Without it, the Lynx Distributor’s fuse LED treats the empty slot as a blown fuse and shows an alarm. The dummy keeps the status display accurate.

Building a Chain Step by Step

Choose M8 or M10 for the whole chain, based on modules you have or plan to buy.
Lay the modules out in order: battery module, shunt or BMS, then one or more distributors.
Bolt the module joints at the manual torque: 14Nm for M8, or 33Nm for M10 (17Nm on older M10 units).
Tighten the middle-row nuts to 10Nm before fitting the fuses.
Fit the MEGA fuses and torque fuse and cable nuts to 14Nm.
Connect the cables with lugs sized for M8 studs and the cable gauge.
Fit the covers before connecting the battery.

Fuse Status and Monitoring

The Lynx Distributor has LEDs that show fuse status. When it’s connected to a Lynx Shunt VE.Can or Lynx Smart BMS, a blown fuse can also appear on a GX device, so you see it on the overview or in VRM instead of opening the cabinet.

Choosing How Many Distributors

Each distributor gives four fused outputs. A van with an inverter, MPPT, DC-DC charger and fuse box fits one. A larger boat or home with several MPPTs, two inverters and DC loads may need two distributors in the same chain, still within the lowest module’s 1000A total.

Spare Parts Worth Carrying

Keep one spare MEGA fuse of each value in your system, plus a few M8 nuts and washers. A blown inverter fuse is a quick swap with the right spare on board, and an unplanned stop without one.

When a Lynx Distributor Is More Than You Need

A small van with one battery, one MPPT and a fuse box can manage with a single busbar and a few MIDI fuses. The Lynx system earns its place once you add a large inverter, several chargers or multiple batteries.

FAQ

Can I use ANL fuses?

No. The Lynx Distributor is designed to fit MEGA fuses.

Is M10 stronger than M8?

Both are rated at 1000A continuous. The M10 joints use a higher torque.

Can I mix M8 and M10 modules with an adapter?

Victron’s manual says the two versions don’t connect directly. Plan the whole chain around one size.

What size cable lugs do I need?

The fuse and cable studs are M8 on both versions, so use M8 lugs sized for your cable.

Do I need a dummy fuse in every empty slot?

Yes, if you want the fuse LED to report correctly. Victron recommends filling all four positions.

Sources: Victron Lynx Distributor M8 and M10 manual and product page (victronenergy.com); Road Widgets, “Add a Victron Energy Lynx Distributor 1000 to your Solar System”; Adam De Lay, “Expanding My System with the Victron 1000A Lynx Busbar”.